JPH11164527A - Manufacture of laminated core and its manufacturing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently manufacture a laminated core having an arbitrary number of slots. SOLUTION: Moving a material W intermittently, cores 1 having groups 11 of slots each comprised of thirteen slots 11a, 11b, 11c ... are punched off into a rotatable squeeze ring 44 and laminated. In this case, processes A', C' for punching the groups 11 of slots are provided, and the phase difference between the positions of groups 11 of slots formed by the process A' and the positions of groups 11 of slots formed by the process C' is set to 180 degrees. Here groups 11 of slots are not formed in the process C' when forming groups 11 of slots in the process A', and groups 11 of the slots are not formed in the process A' when forming groups 11 of slots in the process C'. Moreover, the angle of rotation of the squeeze ring which rotates every time when a specified number of cores 1 are laminated in set to 180 degrees which is identical to the phase difference of the groups 11 of slots.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a laminated iron core used for a stator or a rotor of an electric motor or the like and a method of manufacturing the same.

[0002]

2. Description of the Related Art Generally, when manufacturing a rotor, for example, slots, air holes, caulked portions, shaft holes and the like are punched out sequentially from a strip-shaped steel plate, and an outer core is punched to form an iron core. Are laminated and fixed by a caulking portion. However, since the strip-shaped steel sheet is often not uniform in thickness, the thickness of the punched core is not uniform, and a thickness deviation occurs in the core. When the iron cores having such a thickness deviation are sequentially laminated, the surface of the upper iron core is greatly inclined due to the accumulation of the thickness deviation, and presents a problem that cannot be ignored as a rotor. For this reason, conventionally, every time a predetermined number of cores are stacked, the core is rotated by 180 degrees to eliminate the thickness deviation of the entire rotor.

A manufacturing method for manufacturing a laminated core by eliminating such a thickness deviation is disclosed in, for example, JP-A-56-129.
557. In this method, at the station where the core is pulled out and stacked on the blanking die, the blanking die is rotated by 180 degrees every time a predetermined number of iron cores are stacked. At this time, the index device mechanically divides the rotation of the crankshaft and transmits it to the blanking die to regulate the rotation of the blanking die to 180 degrees.

[0004]

However, the above-mentioned prior art has the following problems. (1) Since the iron core is pulled out and laminated while rotating the blanking die by 180 degrees, it cannot be applied to an iron core having an odd number of slots.

(2) When the number of slots is an odd number of three, seven, nine, etc., the iron core can be rotated by 120, 75, 40, etc., respectively. Since the device cannot be divided into 7 and 9 equal parts, it cannot be applied to an iron core having an odd number of slots in this case as well.

(3) It is conceivable to use a servomotor in place of the index device. However, since the torque of the servomotor is small, it is practically impossible to manufacture a large laminated iron core having an odd number of slots. become.

(4) When manufacturing a large iron core having an odd number of slots, the workability is extremely poor because a worker rotates a predetermined number of laminated cores outside the mold by a predetermined angle.

An object of the present invention is to solve the above-mentioned problems and to provide a method of manufacturing a laminated core that can efficiently produce a laminated core having an arbitrary number of slots.

Another object of the present invention is to provide an apparatus for manufacturing a laminated iron core which is directly used for carrying out the above-described method.

[0010]

According to the present invention, there is provided a method for manufacturing a laminated core according to the present invention, wherein an iron core having slots is drawn into a rotatable die while intermittently moving a strip-shaped steel plate. In the case of stacking by stacking, the method includes a plurality of first steps of punching the slots so as to have a phase difference with each other, and a second step of stacking the core by punching the core into the die. In the step, the die is rotated by the same angle as the phase difference every time a predetermined number of the cores are pulled out.

The apparatus for manufacturing a laminated core according to the present invention is characterized in that a core having a slot group consisting of an odd number of slots is drawn into a rotatable die and laminated while intermittently moving a strip-shaped steel plate. In the manufacturing apparatus, a plurality of punching means for punching the slot group so as to have a phase difference with each other, and a rotating means for rotating the die by the same angle as the phase difference according to the punching means are provided. It is characterized by.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 is a partial plan view of an iron core 1 constituting a laminated iron core of the present invention. The iron core 1 is assumed to be used for, for example, a rotor, and the iron core 1 has, for example, thirteen slots 11a, 11b, 11c are formed along the peripheral edge, and four air holes 12 are formed.
And four caulking portions 13 are alternately formed on the inner circumference of the slot 11, and one shaft hole 14 is formed at the center.

The caulking portion 13 is a portion for caulking and fixing the laminated iron cores 1 and can have any shape. In this embodiment, as shown in, for example, a partially enlarged cross-sectional view of FIG. 2, a through hole 13a is formed in the iron core 1 as a measuring plate disposed at the lowermost layer of the laminated core, and the core 1 disposed at the upper layer is formed. As shown in FIG. 3, a concave portion 13b is formed, and a convex portion 13c that can be fitted into the through hole 13a of the lowermost core 1 or the concave portion 13b of the upper core 1 is formed.

FIG. 4 is a schematic configuration diagram of a manufacturing apparatus for manufacturing a laminated iron core. The manufacturing apparatus includes a die 21 for punching and laminating the iron core 1 from a material W, and a control device 22 for controlling the die 21. Is provided, and the mold 21 is provided on the movable upper mold 2.
3. Lower mold 24 on fixed side, upper mold 23 and lower mold 24
And a stripper 25 disposed between them. The material W made of a strip-shaped steel sheet is fed between the lower mold 24 and the stripper 25 in order.

The mold 21 is provided with stations A to G for sequentially processing the iron core 1 from the material W. A station A is provided with a slot group 11 and a punch 30 and a die 31 for forming a pilot hole to be described later, and a station B is provided with a punch 40 for forming an air hole 12.
And a die (not shown) are provided. The station C is provided with a punch 34 and a die 35 for forming the slot group 11 at a position having a phase difference of, for example, 180 degrees from the position of the slot group 11 punched in the process A.

The through hole 13 of the caulked portion is provided in the station D.
A punch 36 and a die 37 for forming a are provided.
Station E has a concave portion 13b and a convex portion 13c of the caulked portion.
A punch 38 and a die 39 for forming the shaft hole 14 are provided, and a punch 40 and a die 41 for forming the shaft hole 14 are provided. Note that the station F is at the idle position.

The station G is provided with a punch 42 and a die 43 for forming the outer shape of the iron core 1, and the die 43 is fixed to a squeeze ring 44 rotatably held by the lower mold 24. . A sprocket 45 is provided on the outer periphery of the lower portion of the squeeze ring 44, and the sprocket 45 is connected to a rotation driving means (not shown) via a timing belt 46. The rotation driving means has index means, and can rotate the squeeze ring 44 by a predetermined amount.

Here, stations A, C and D are provided with position changing means for changing the positions of the punches 31, 34 and 36 in the vertical direction.
Can be switched between a punching position at which the material W can be punched and a retracting position at which the material W cannot be punched. For example, the position changing means of the station A is shown in FIG.
As shown in FIG.
Up and down moving cam 52 which moves up and down, and a horizontal moving cam 53 which moves in the horizontal direction above the up and down moving cam 52
And a cylinder 54 for driving the horizontal motion cam 53. The cylinder 54 is controlled by the control device 22 described above.

The vertical movement cam 52 has a projection 52a and a groove 52b.
Are formed, and the horizontal movement cam 53 has a projection 53a and a groove 53b.
Are formed. When the horizontal motion cam 53 is driven in the Y direction, the projections 52a, 53a and the grooves 52b,
The meshing of the punch 3b is prevented, and the punch 31 is fixed at the punching position. When the horizontal motion cam 53 is driven in the opposite Z direction as shown in FIG.
a, 53a and the grooves 52b, 53b mesh with each other, and the punch 31 is fixed at the retracted position.

Such a manufacturing apparatus manufactures a laminated core based on steps A 'to G' as shown in FIG. That is, in step A ′ corresponding to station A, two pilot holes 15 and 13 for feeding material W are provided.
The slot groups 11 are punched out. In step B ′ corresponding to station B, four air holes 12 are punched. In the step C ′ corresponding to the station C, the slot group 11 is punched out when the slot group 11 is not punched in the step A ′. In a process D ′ corresponding to the station D, the through hole 13a is punched out when forming the iron core 1 located at the lowermost layer. In the process E ′ corresponding to the station E, when forming the iron core 1 located in the upper layer, the concave portion 13 b and the convex portion 13
c is formed and the shaft hole 14 is punched. Then, in a process G ′ corresponding to the station G, the outer shape of the iron core 1 is punched, and the iron core 1 is pushed into the squeeze ring 44.

At this time, in order to form the iron core 1 located at the lowermost layer, the position changing means operates the punch 3 of the station A.
1 and the punch 34 of the station C is fixed to the retracted position while the punch 3 of the station A is fixed.
Only one punches out slot group 11. Next, the punch 33 of the station B punches out the air hole 12. Subsequently, the position changing means holds the punch 36 of the station D at the punching position, and the punch 36 punches the through hole 13a. Thereafter, the punch 38 of the station E acts on the caulking portion 13, and the punch 40 punches the shaft hole 14. Then, the punch 42 of the station G pulls the iron core 1 into the squeeze ring 44. Finally, the squeeze ring 4
4 is rotated 180 degrees. At this time, since a frictional force exists between the outer peripheral surface of the iron core 1 and the inner peripheral surface of the squeeze ring 44, the iron core 1 rotates integrally with the squeeze ring 44.

Next, in order to form the iron core 2 of the second layer,
The position changing means fixes the punch 31 of the station A at the retracted position, and fixes the punch 34 of the station C at the removal position, and only the punch 34 of the station C punches the slot group 11. Next, the position changing means fixes the punch 36 of the station D at the retracted position, and the punch 38 of the station E
While forming c, the punch 40 punches the shaft hole 14. Then, the punch 42 of the station G pulls the iron core 1 into the squeeze ring 44. At this time, the punch 42
Presses the upper surface of the iron core 1 of the second layer, and the convex portion 1 of the iron core 1
3c is pressed into the through hole 13a of the lowermost iron core 1,
The iron cores 1 are fixed. Finally, the squeeze ring 44 is rotated 180 degrees again.

Thus, the punch 31 and the punch 34
Each time the position is switched, the squeeze ring 44 is rotated 180 degrees, and a predetermined number of iron cores 1 are laminated and fixed in the squeeze ring 44.

In this embodiment, the iron cores 1 in which the phases of the slot groups 11 are different by 180 degrees are punched out sequentially, and
Since the lamination is performed while rotating by 0 degrees, even when the material W has an uneven thickness and the iron core 1 has an odd number of slot groups 11, the influence of the thickness deviation can be eliminated and the iron core 1 is automatically laminated and fixed. It can contribute to the improvement of manufacturing efficiency and quality. Further, the conventional indexing device can be used, and a large laminated iron core having an odd number of slots can be manufactured.

Although the rotor has been described in the embodiment, the stator (stator) can be manufactured by the same manufacturing method and manufacturing apparatus. Further, the squeeze ring 44 is rotated by 180 degrees each time one core 1 is pulled out.
4 can be rotated.
In the case where the squeeze ring 44 is constituted by a plurality of iron cores 1, the squeeze ring 44 can be rotated after stacking half of the 25 iron cores 1.

Further, although the phase difference between the slot group 11 formed at the station A and the slot group 11 formed at the station C is set to 180 degrees, other angles can be used. For example, when the phase difference is set to 120 degrees, the stations for punching the slot group 11 are provided at three locations, and when the phase difference is set to 90 degrees, the stations for punching the slot group 11 are provided at four locations.

[0027]

As described above, the method and apparatus for manufacturing a laminated core according to the present invention punch out a group of slots so as to have a mutual phase difference, and rotate the die by the same angle as the phase difference. In the case where the steel sheet has uneven thickness and the slot group has an odd number of slots, it is possible to eliminate the influence on the thickness deviation and to automatically stack and fix the iron core, It can contribute to the improvement of manufacturing efficiency and quality of laminated iron core. In addition, the use of a conventional index device becomes possible, and a large laminated iron core can be manufactured.

[Brief description of the drawings]

FIG. 1 is a plan view of an iron core.

FIG. 2 is a cross-sectional view of a caulked portion.

FIG. 3 is a cross-sectional view of another caulked portion.

FIG. 4 is a schematic configuration diagram of a manufacturing apparatus.

FIG. 5 is a sectional view taken along line XX of FIG. 4;

FIG. 6 is an operation explanatory view.

FIG. 7 is a layout diagram of an iron core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Iron core 11 Slot group 13 Caulking part 21 Die 22 Control device 31, 34 Punch for slot punching 42 Punch for external punching 43 Die for external punching 44 Squeeze ring material W

Claims (4)

[Claims] When a strip-shaped steel sheet is intermittently moved and an iron core having a group of slots is drawn into a rotatable die and laminated, a plurality of punches punching out the slots so as to have a phase difference with each other. 1) and a second step of extracting and laminating the core in the die. In the second step, the die is rotated by the same angle as the phase difference every time a predetermined number of cores are extracted. A method for manufacturing a laminated iron core. 2. The method according to claim 1, wherein the group of slots comprises an odd number of slots. 3. An apparatus for manufacturing a laminated core in which an iron core having a slot group composed of an odd number of slots is drawn out and laminated inside a rotatable die while intermittently moving a strip-shaped steel sheet. A plurality of punching means for punching said group of slots so as to have a rotating means for rotating said die by the same angle as said phase difference in accordance with said punching means. . 4. A means for preventing one of said punching means from punching said slot group when one of said punching means punches said group of slots.
5. The apparatus for manufacturing a laminated iron core according to claim 1.